/**
**********************************************************************
* @file     main.c
* @brief    对文件的简要说明
* @details  对文件的详细说明
* @author   jcai
* @date     2022-05-03 13:35:55
* @copyright Copyright &copy; 2022 wy1107412334@163.com All rights reserved
* @version  v0.0.1
*
* \n Email:  wy1107412334@163.com
* \n Blog:   None
* \n Github: https://github.com/wy1107412334
* \n Gitee:  https://gitee.com/git.git1107412334.com
*
**********************************************************************
* @note
* None.
**********************************************************************
* @attention
* None.
**********************************************************************
@verbatim
@endverbatim
**********************************************************************
* @par 历史记录
* 1. v0.0.1: jcai, 2022-05-03 13:35:55
*   - 首次编写
*
*<center>Copyright &copy; 2022 wy1107412334@163.com All rights reserved</center>
**********************************************************************
*/

/* 头文件导入区 --------------------------------------------------- */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include <SDL/SDL_ttf.h>


// 窗口属性
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
const int SCREEN_BPP = 32;

// 将要使用的表面
SDL_Surface *background = NULL;
SDL_Surface *startStop = NULL;
SDL_Surface *pauseMessage = NULL;
SDL_Surface *seconds = NULL;
SDL_Surface *screen = NULL;

// 事件结构体
SDL_Event event;

// 要显示的文字的字体
TTF_Font *font = NULL;
// 字体颜色
SDL_Color textColor = { 0, 0, 0 };

static int startTicks;
static int pausedTicks;
static int paused;
static int started;


SDL_Surface *load_image(const char *file)
{
    SDL_Surface *loadedImage = NULL;
    SDL_Surface *optimizedImage = NULL;

    // 通过 SDL_imag 模块加载图片
    loadedImage = IMG_Load(file);
    if (!loadedImage)   return NULL;

    optimizedImage = SDL_DisplayFormat(loadedImage);
    SDL_FreeSurface(loadedImage);
    if (optimizedImage)
    {
        // 映射关键色
        uint32_t keycolor = SDL_MapRGB(optimizedImage->format, 0, 0xff, 0xff);
        // 将所有颜色为 RGB(0x00, 0xff, 0xff) 的像素设为透明
        SDL_SetColorKey(optimizedImage, SDL_SRCCOLORKEY, keycolor);
    }

    return optimizedImage;
}

void apply_surface(int x, int y, SDL_Surface *src, SDL_Surface *dst)
{
    SDL_Rect offset;

    offset.x = x;
    offset.y = y;

    SDL_BlitSurface(src, NULL, dst, &offset);
}

int init()
{
    if (SDL_Init(SDL_INIT_EVERYTHING) == -1)
        return -1;

    screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP,
                              SDL_SWSURFACE);
    if (!screen)
    {
        SDL_Quit();
        return -2;
    }

    if (TTF_Init() == -1)
    {
        SDL_Quit();
        return -3;
    }

    SDL_WM_SetCaption("Timer Test", NULL);

#if 0
    // 给窗口背景填充白色
    SDL_FillRect(screen, &screen->clip_rect,
                 SDL_MapRGB(screen->format, 0xff, 0xff, 0xff));
#endif

    return 0;
}

int load_files()
{
    // 加载背景图片
    background = load_image("background.png");
    if (!background)    return -1;

    font = TTF_OpenFont("lazy.ttf", 30);
    if (!font)
    {
        SDL_FreeSurface(background);
        return -2;
    }

    return 0;
}

void clean_up()
{
    SDL_FreeSurface(background);
    SDL_FreeSurface(startStop);
    SDL_FreeSurface(pauseMessage);

    TTF_CloseFont(font);
    TTF_Quit();

    SDL_Quit();
}


void timer_init()
{
    startTicks = 0;
    pausedTicks = 0;
    paused = 0;
    started = 0;
}
void timer_start()
{
    started = 1;
    paused = 0;

    startTicks = SDL_GetTicks();
}
void timer_stop()
{
    started = 0;
}
void timer_pause()
{
    if (started && !paused)
    {
        paused = 1;
        pausedTicks = SDL_GetTicks() - startTicks;
    }
}
void timer_unpause()
{
    if (paused)
    {
        paused = 0;

        startTicks = SDL_GetTicks() - pausedTicks;
        pausedTicks = 0;
    }
}
int timer_get_ticks()
{
    if (started)
    {
        if (paused)
            return pausedTicks;
        else
            return SDL_GetTicks() - startTicks;
    }
    return 0;
}
int timer_is_started()
{
    return started;
}
int timer_is_paused()
{
    return paused;
}



/**
**********************************************************************
* @brief    简要说明
* @details  详细说明
* @param    none
* @param[in]     a: 该参数用于输入
* @param[in,out] b: 该参数用于输入和输出
* @param[out]    c: 该参数用于输出
* @retval  none
* @retval  0 函数成功
* @retval  1 函数失败
* @return  返回0成功；否则失败
* @note    none
*/
int main(int argc, char *argv[])
{
    char text[100];
    int quit = 0;

    if (init() != 0)
    {
        fprintf(stderr, "SDL初始化失败\n");
        return EXIT_FAILURE;
    }
    if (load_files() != 0)
    {
        fprintf(stderr, "SDL加载 background.png 失败\n");
        return EXIT_FAILURE;
    }

    // 渲染文本
    startStop = TTF_RenderText_Solid(font,
            "Press S to start or stop the timer", textColor);
    pauseMessage = TTF_RenderText_Solid(font,
            "Press P to pause or unpause the timer", textColor);

    // 初始化定时器
    timer_init();
    // 开启定时
    timer_start();

    while (!quit)
    {
        // 处理SDL的事件
        while (SDL_PollEvent(&event))
        {
            // 如果有按钮按下
            if (event.type == SDL_KEYDOWN)
            {
                // 是按键 s 被按下
                if (event.key.keysym.sym == SDLK_s)
                {
                    // 如果定时器在运行中
                    if (timer_is_started())
                        // 停止定时器
                        timer_stop();
                    else
                        // 开启定时器
                        timer_start();
                }
                // 是按钮 p 被按下
                if (event.key.keysym.sym == SDLK_p)
                {
                    if (timer_is_paused())
                        timer_unpause();
                    else
                        timer_pause();
                }
            }

            // 如果用户点击了窗口右上角的关闭按钮
            if (event.type == SDL_QUIT)
            {
                quit = 1;
                printf("处理退出事件\n");
            }
        }

        apply_surface(0, 0, background, screen);
        apply_surface((SCREEN_WIDTH - startStop->w) / 2,
                      200,
                      startStop,
                      screen);
        apply_surface((SCREEN_WIDTH - pauseMessage->w) / 2,
                      250,
                      pauseMessage,
                      screen);

        snprintf(text, 100, "Timer: %f", timer_get_ticks() / 1000.0f);
        seconds = TTF_RenderText_Solid(font, text, textColor);
        apply_surface((SCREEN_WIDTH - seconds->w) / 2,
                      0,
                      seconds,
                      screen);
        SDL_FreeSurface(seconds);

        // 更新窗口
        if (SDL_Flip(screen) == -1)
        {
            fprintf(stderr, "SDL更新窗口失败\n");
            break;
        }
    }

    clean_up();

    return 0;
}




/***  Copyright (C) 2022 wy1107412334@163.com All rights reserved ***/
/****************************** END OF FILE *************************/

